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Mental Addition Worksheet for Class 2 and 3

Mental maths lesson 6: Add 2-digit numbers left to right · Set 850 · 40 questions
TalentJR

How to do it in your head (Tens first): Keep the first number as it is. Add the tens of the second number. Add the ones.

NameDateTime takenScore ___ / 40
  1. 1.30 + 39 =
  2. 2.35 + 42 =
  3. 3.74 + 84 =
  4. 4.29 + 45 =
  5. 5.57 + 24 =
  6. 6.42 + 23 =
  7. 7.29 + 55 =
  8. 8.26 + 53 =
  9. 9.62 + 21 =
  10. 10.61 + 31 =
  11. 11.89 + 89 =
  12. 12.26 + 18 =
  13. 13.70 + 32 =
  14. 14.83 + 42 =
  15. 15.37 + 58 =
  16. 16.82 + 78 =
  17. 17.31 + 22 =
  18. 18.38 + 88 =
  19. 19.79 + 78 =
  20. 20.52 + 47 =
  21. 21.68 + 74 =
  22. 22.26 + 34 =
  23. 23.29 + 77 =
  24. 24.37 + 18 =
  25. 25.50 + 44 =
  26. 26.73 + 49 =
  27. 27.29 + 12 =
  28. 28.81 + 22 =
  29. 29.32 + 64 =
  30. 30.86 + 69 =
  31. 31.61 + 57 =
  32. 32.51 + 82 =
  33. 33.85 + 27 =
  34. 34.57 + 43 =
  35. 35.40 + 39 =
  36. 36.45 + 74 =
  37. 37.79 + 21 =
  38. 38.64 + 14 =
  39. 39.79 + 29 =
  40. 40.45 + 42 =

Answer key

  1. 69
  2. 77
  3. 158
  4. 74
  5. 81
  6. 65
  7. 84
  8. 79
  9. 83
  10. 92
  11. 178
  12. 44
  13. 102
  14. 125
  15. 95
  16. 160
  17. 53
  18. 126
  19. 157
  20. 99
  21. 142
  22. 60
  23. 106
  24. 55
  25. 94
  26. 122
  27. 41
  28. 103
  29. 96
  30. 155
  31. 118
  32. 133
  33. 112
  34. 100
  35. 79
  36. 119
  37. 100
  38. 78
  39. 108
  40. 87

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